Messages in this thread | | | Date | Mon, 7 Jun 2010 19:28:44 +0200 | Subject | Re: Linux 2.6.35-rc2 | From | Torsten Kaiser <> |
| |
On Mon, Jun 7, 2010 at 8:52 AM, Dave Airlie <airlied@gmail.com> wrote: > On Mon, Jun 7, 2010 at 4:32 PM, Alex Deucher <alexdeucher@gmail.com> wrote: >> On Mon, Jun 7, 2010 at 2:22 AM, Dave Airlie <airlied@gmail.com> wrote: >>> On Mon, Jun 7, 2010 at 4:09 PM, Torsten Kaiser >>> <just.for.lkml@googlemail.com> wrote: >>>> The switchoff intervall is ~10 seconds, not 1..2 as I guessed in the first mail. >>>> Any idea if there is something in the KMS code that triggers at this intervall? >>> >>> The new mode probing code happens every 10 seconds, though we >>> shouldn't be turning anything on or off with it. >>> >>> So I suspect the DAC detection table might be doing bad things on your >>> hardware, we have had a problem where the dac detect table on one DAC >>> would turn the other one off which clearly wasn't what we wanted to >>> see. >>> , >> >> The x300 is a non-atom card, so it uses the legacy load detection >> routines which do mess with some of the crtc regs. >> > > Okay I see it now, I'm amazed that I was seeing this issue last week > and blaming it on something complete different and only seeing it on > one card. > > I expect its the same problem I'll try and track down a proper fix for > it tomorrow.
It really seems to be this polling code. After the fix to drivers/char/vt.c the 2.6.35-rc2 kernel now works for me without crashing.
I also changed #define DRM_OUTPUT_POLL_PERIOD (10*HZ) to #define DRM_OUTPUT_POLL_PERIOD (3*HZ) and now the flickering before X starts is at a three second interval. That should prove, that the polling from drm_crtc_helper.c is the cause.
After X starts the LCD is stable, but the secondary CRT still flickers every 3 seconds.
My hardware is an X300-PCIe card with a VGA-, a DVI-I- and a video output. I have a 1280x1024 LCD attached to the DVI-I and an old CRT to the VGA. The video output is unused. The CRT is normally switched off, but its still detected correctly.
The kernel output from 2.6.34 and 2.6.35-rc2 is here: http://lkml.org/lkml/2010/6/6/126
xrandr says: Screen 0: minimum 320 x 200, current 2080 x 1024, maximum 4096 x 4096 DVI-0 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 338mm x 270mm 1280x1024 60.0*+ 75.0 1280x960 60.0 1152x864 75.0 1024x768 75.1 70.1 60.0 832x624 74.6 800x600 72.2 75.0 60.3 56.2 640x480 72.8 75.0 66.7 60.0 720x400 70.1 640x400 70.0 VGA-0 connected 800x600+1280+150 (normal left inverted right x axis y axis) 280mm x 210mm 800x600 72.2*+ 75.0 60.3 56.2 1280x1024 60.0 1024x768 75.1 70.1 60.0 640x480 72.8 75.0 60.0 720x400 87.8 70.1 S-video disconnected (normal left inverted right x axis y axis)
If you have something for me to try, just send it. :-)
Torsten
| |