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SubjectOdd screen blanking between X and shells
[1.] One line summary of the problem:
Often switching from X to VC/VT will cause screen to be blank or dim. 'reset'
fixes.

[2.] Full description of the problem/report:
I start X. Do some work. Move to a VC without X to do some different work. Go
back to X. Do some more. Then I go back to VC whether it is a logged in one or
not and I have a blank or dim screen. reset at the shell prompt fixes them all.

[3.] Keywords (i.e., modules, networking, kernel):
X, virtual terminal, screen, black/blank, dim, dark

[4.] Kernel version (from /proc/version):
Linux version 2.4.0-test4 (root@aurora.acdlaamns.net) (gcc version egcs-2.91.66
19990314/Linux (egcs-1.1.2 release)) #9 Wed Jul 12 17:49:15 EDT 2000

[5.] Output of Oops.. message (if applicable) with symbolic information
resolved (see Documentation/oops-tracing.txt)
no oopses it seems

[6.] A small shell script or example program which triggers the
problem (if possible)
usually I am doing a make on the non-X terminal

[7.] Environment
mixture of X and bash

[7.1.] Software (add the output of the ver_linux script here)
-- Versions installed: (if some fields are empty or look
-- unusual then possibly you have very old versions)
Linux aurora.acdlaamns.net 2.4.0-test4 #9 Wed Jul 12 17:49:15 EDT 2000 i686
unknown
Kernel modules 2.3.10-pre1
Gnu C egcs-2.91.66
Binutils 2.9.5.0.22
Linux C Library 2.1.3
Dynamic linker ldd (GNU libc) 2.1.3
Procps 2.0.6
Mount 2.10f
Net-tools 1.54
Console-tools 0.3.3
Sh-utils 2.0
Modules Loaded

[7.2.] Processor information (from /proc/cpuinfo):
processor : 0
vendor_id : AuthenticAMD
cpu family : 6
model : 2
model name : AMD Athlon(tm) Processor
stepping : 1
cpu MHz : 798.478231
cache size : 512 KB
fdiv_bug : no
hlt_bug : no
sep_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36
mmxext mmx fxsr 3dnowext 3dnow
bogomips : 1592.52

[7.3.] Module information (from /proc/modules):
none

[7.4.] Loaded driver and hardware information (/proc/ioports, /proc/iomem)
0000-001f : dma1
0020-003f : pic1
0040-005f : timer
0060-006f : keyboard
0070-007f : rtc
0080-008f : dma page reg
00a0-00bf : pic2
00c0-00df : dma2
00f0-00ff : fpu
0170-0177 : ide1
01f0-01f7 : ide0
02f8-02ff : serial(auto)
0376-0376 : ide1
03c0-03df : vga+
03f6-03f6 : ide0
0400-040f : VIA Technologies, Inc. VT82C686 [Apollo Super ACPI]
0cf8-0cff : PCI conf1
5000-5003 : acpi
5004-5005 : acpi
5008-500b : acpi
5020-5023 : acpi
6000-607f : VIA Technologies, Inc. VT82C686 [Apollo Super ACPI]
8000-8fff : PCI Bus #01
c000-c0ff : Symbios Logic Inc. (formerly NCR) 53c875
c000-c07f : sym53c8xx
cc00-ccff : Trident Microsystems 4DWave NX
cc00-ccff : Trident 4DWave NX
d000-d07f : Digital Equipment Corporation DECchip 21140 [FasterNet]
d000-d07f : eth0
d400-d403 : Advanced Micro Devices [AMD] AMD-751 [Irongate] System Controller
d800-d8ff : Symbios Logic Inc. (formerly NCR) 53c875 (#2)
d800-d87f : sym53c8xx
ffa0-ffaf : VIA Technologies, Inc. VT82C586 IDE [Apollo]
ffa0-ffa7 : ide0
ffa8-ffaf : ide1
00000000-0009fbff : System RAM
0009fc00-0009ffff : reserved
000a0000-000bffff : Video RAM area
000c0000-000c7fff : Video ROM
000f0000-000fffff : System ROM
00100000-07feffff : System RAM
00100000-0020bb0f : Kernel code
0020bb10-002225af : Kernel data
07ff0000-07ff7fff : ACPI Tables
07ff8000-07ffffff : ACPI Non-volatile Storage
ddc00000-ddcfffff : PCI Bus #01
e0000000-e7ffffff : Advanced Micro Devices [AMD] AMD-751 [Irongate] System
Controller
eddff000-eddfffff : Advanced Micro Devices [AMD] AMD-751 [Irongate] System
Controller
ede00000-efefffff : PCI Bus #01
ee800000-eeffffff : Texas Instruments TVP4020 [Permedia 2]
ef000000-ef7fffff : Texas Instruments TVP4020 [Permedia 2]
efee0000-efefffff : Texas Instruments TVP4020 [Permedia 2]
efffc000-efffcfff : Symbios Logic Inc. (formerly NCR) 53c875
efffd000-efffdfff : Trident Microsystems 4DWave NX
efffe000-efffefff : Symbios Logic Inc. (formerly NCR) 53c875 (#2)
effffd00-effffdff : Symbios Logic Inc. (formerly NCR) 53c875
effffe80-effffeff : Digital Equipment Corporation DECchip 21140 [FasterNet]
effffe80-effffeff : eth0
efffff00-efffffff : Symbios Logic Inc. (formerly NCR) 53c875 (#2)
ffff0000-ffffffff : reserved

[7.5.] PCI information ('lspci -vvv' as root)
00:00.0 Host bridge: Advanced Micro Devices [AMD] AMD-751 [Irongate] System
Controller (rev 25)
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping-
SERR+ FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort-
<MAbort+ >SERR- <PERR-
Latency: 64 set
Region 0: Memory at e0000000 (32-bit, prefetchable) [size=128M]
Region 1: Memory at eddff000 (32-bit, prefetchable) [size=4K]
Region 2: I/O ports at d400 [disabled] [size=4]
Capabilities: [a0] AGP version 1.0
Status: RQ=15 SBA+ 64bit- FW- Rate=x1,x2
Command: RQ=0 SBA- AGP- 64bit- FW- Rate=<none>

00:01.0 PCI bridge: Advanced Micro Devices [AMD] AMD-751 [Irongate] AGP Bridge
(rev 01) (prog-if 00 [Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping-
SERR+ FastB2B-
Status: Cap- 66Mhz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort-
<MAbort- >SERR- <PERR-
Latency: 64 set
Bus: primary=00, secondary=01, subordinate=01, sec-latency=64
I/O behind bridge: 00008000-00008fff
Memory behind bridge: ede00000-efefffff
Prefetchable memory behind bridge: ddc00000-ddcfffff
BridgeCtl: Parity- SERR+ NoISA- VGA+ MAbort- >Reset- FastB2B-

00:04.0 Ethernet controller: Digital Equipment Corporation DECchip 21140
[FasterNet] (rev 22)
Subsystem: Netgear: Unknown device 1100
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- Stepping-
SERR+ FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort
- <MAbort- >SERR- <PERR-
Latency: 20 min, 40 max, 64 set, cache line size 08
Interrupt: pin A routed to IRQ 10
Region 0: I/O ports at d000 [size=128]
Region 1: Memory at effffe80 (32-bit, non-prefetchable) [size=128]
Expansion ROM at eff80000 [disabled] [size=256K]

00:06.0 Multimedia audio controller: Trident Microsystems 4DWave NX (rev 02)
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping-
SERR+ FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort-
<MAbort- >SERR- <PERR-
Latency: 2 min, 5 max, 64 set
Interrupt: pin A routed to IRQ 9
Region 0: I/O ports at cc00 [size=256]
Region 1: Memory at efffd000 (32-bit, non-prefetchable) [size=4K]
Capabilities: [48] Power Management version 1
Flags: PMEClk- AuxPwr- DSI- D1+ D2+ PME-
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:07.0 ISA bridge: VIA Technologies, Inc. VT82C686 [Apollo Super] (rev 1b)
Subsystem: VIA Technologies, Inc.: Unknown device 0000
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping+
SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort-
<MAbort- >SERR- <PERR-
Latency: 0 set

00:07.1 IDE interface: VIA Technologies, Inc. VT82C586 IDE [Apollo] (rev 06)
(prog-if 8a [Master SecP PriP])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping-
SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort-
<MAbort- >SERR- <PERR-
Latency: 32 set
Region 4: I/O ports at ffa0 [size=16]
Capabilities: [c0] Power Management version 2
Flags: PMEClk- AuxPwr- DSI- D1- D2- PME-
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:07.4 SMBus: VIA Technologies, Inc. VT82C686 [Apollo Super ACPI] (rev 20)
Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Step
ping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort-
<MAbort- >SERR- <PERR-

00:09.0 SCSI storage controller: Symbios Logic Inc. (formerly NCR) 53c875 (rev
14)
Subsystem: Diamond Multimedia Systems FirePort 40 Dual SCSI Controller
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr+ Stepping-
SERR+ FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort-
<MAbort- >SERR- <PERR-
Latency: 17 min, 64 max, 144 set, cache line size 08
Interrupt: pin A routed to IRQ 11
Region 0: I/O ports at c000 [size=256]
Region 1: Memory at effffd00 (32-bit, non-prefetchable) [size=256]
Region 2: Memory at efffc000 (32-bit, non-prefetchable) [size=4K]
Expansion ROM at effd0000 [disabled] [size=64K]

00:09.1 SCSI storage controller: Symbios Logic Inc. (formerly NCR) 53c875 (rev
14)

Subsystem: Diamond Multimedia Systems FirePort 40 Dual SCSI Controller
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr+ Stepping-
SERR+ FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort-
<MAbort- >SERR- <PERR-
Latency: 17 min, 64 max, 144 set, cache line size 08
Interrupt: pin A routed to IRQ 11
Region 0: I/O ports at d800 [size=256]
Region 1: Memory at efffff00 (32-bit, non-prefetchable) [size=256]
Region 2: Memory at efffe000 (32-bit, non-prefetchable) [size=4K]
Expansion ROM at <unassigned> [disabled] [size=64K]

01:05.0 Display controller: Texas Instruments TVP4020 [Permedia 2] (rev 01)
Subsystem: LeadTek Research Inc.: Unknown device 2633
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping-
SERR- FastB2B-
Status: Cap+ 66Mhz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort-
<MAbort- >SERR- <PERR-
Latency: 192 min, 192 max, 64 set
Interrupt: pin A routed to IRQ 11
Region 0: Memory at efee0000 (32-bit, non-prefetchable) [size=128K]
Region 1: Memory at ef000000 (32-bit, non-prefetchable) [size=8M]
Region 2: Memory at ee800000 (32-bit, non-prefetchable) [size=8M]
Expansion ROM at efed0000 [disabled] [size=64K]
Capabilities: [40] AGP version 1.0
Status: RQ=31 SBA+ 64bit- FW- Rate=x1
Command: RQ=0 SBA- AGP- 64bit- FW- Rate=<none>

[7.6.] SCSI information (from /proc/scsi/scsi)
Attached devices:
Host: scsi1 Channel: 00 Id: 05 Lun: 00
Vendor: NEC Model: CD-ROM DRIVE:464 Rev: 1.05
Type: CD-ROM ANSI SCSI revision: 02
Host: scsi1 Channel: 00 Id: 06 Lun: 00
Vendor: RICOH Model: MP6200S Rev: 2.40
Type: CD-ROM ANSI SCSI revision: 02

Trever Adams

P.S. I might be the only one having this problem. I didn't use 2.4.0test2 but
2.4.0test1 was fine... all test3's and 4's I have tried are bad.
--
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