Messages in this thread | | | Date | Sun, 14 Oct 2012 12:54:34 -0400 | From | Mark Hounschell <> | Subject | Re: Intel graphics drm issue? |
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On 10/14/2012 07:03 AM, Bruno Prémont wrote: > On Sun, 14 October 2012 Mark Hounschell <dmarkh@cfl.rr.com> wrote: >> On 10/14/2012 04:41 AM, Bruno Prémont wrote: >>> Your best solution is probably to write an EDID blob (or reuse one you find >>> somewhere) that provides at least one mode matching your TV's native mode >>> (probably full-HD). >>> >>> Google suggested the following document: >>> http://www.jordansmanuals.com/ServiceManuals%5CLG%5CTV%5CLCD%5C42LB9DF%5C42LB9DF%20Service%20Manual.pdf >>> which on page 13/14 shows the full EDID blob for the various HDMI outputs of the >>> TV. You may want to read that document, convert the EDID blobs to 512 bytes binary >>> files and hell DRM core to use the right one via module/kernel cmdline option: >>> >>> drm_kms_helper.edid_firmware=edid/lg42lb9df.edid >>> or >>> modprobe drm-kms-helper edid_firmware=edid/lg42lb9df.edid >>> >>> where >>> /lib/firmware/edid/lg42lb9df.edid >>> is the 512-bytes EDID blob created according to data from above manual. >>> (note, that will only work for intel, radeon and nouveau drivers but will >>> not work for closed drivers of AMD/nVidia) >>> >> >> This certainly looks doable. That firmware file, should it contain all 4 >> tables or just the one for the port I'm connected to? Will it matter what >> order they were in? > > It should contain just the table for the port you're connected to. > For the HDMI ports the tables are 1024 bytes (e.g. two 512 bytes blocks, > not just one as I incorrectly wrote above). For the VGA port it's just one > 512 bytes block. > > Oh, and check the exact documentation of edid_firmware parameter as you can > adjust its value to tell kernel to which connector exactly it applies > (otherwise it will overwrite the EDID on other ports with working displays!). >
Hi Bruno,
I've taken the EDID data from that service manual. I've looked at the EDID-Howto for how to specify the connector but all I see is:
"An EDID data set will only be used for a particular connector, if its name and a colon are prepended to the EDID name."
Where can I find the connector names?
And could I ask if this simple pgm might work to build the file I need?
int32_t main(int argc, char **argv) { FILE *fd; const char *path = "/lib/firmware/edid/lg42lb9df.edid"; const char *mode = "w+"; uint8_t firmware[1024] = {
0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x1E, 0x6D, 0x01, 0x00, 0x01, 0x01, 0x01, 0x01, 0x0E, 0x10, 0x01, 0x03, 0x80, 0x73, 0x41, 0x96, 0x0A, 0xCF, 0x74, 0xA3, 0x57, 0x4C, 0xB0, 0x23, 0x09, 0x48, 0x4C, 0xAF, 0xCF, 0x00, 0x31, 0x40, 0x45, 0x40, 0x61, 0x40, 0x81, 0x80, 0xA9, 0x40, 0xD1, 0xC0, 0x01, 0x01, 0x01, 0x01, 0x02, 0x3A, 0x80, 0x18, 0x71, 0x38, 0x2D, 0x40, 0x58, 0x2C, 0x45, 0x00, 0xC4, 0x8E, 0x21, 0x00, 0x00, 0x1E, 0x66, 0x21, 0x50, 0xB0, 0x51, 0x00, 0x1B, 0x30, 0x40, 0x70, 0x36, 0x00, 0xC4, 0x8E, 0x21, 0x00, 0x00, 0x1E, 0x00, 0x00, 0x00, 0xFD, 0x00, 0x38, 0x4B, 0x1F, 0x44, 0x0F, 0x00, 0x0A, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00, 0x00, 0x00, 0xFC, 0x00, 0x4C, 0x47, 0x20, 0x54, 0x56, 0x0A, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x01, 0x15,
0x02, 0x03, 0x1B, 0xF1, 0x4C, 0x20, 0x22, 0x10, 0x1F, 0x01, 0x02, 0x03, 0x04, 0x05, 0x12, 0x93, 0x14, 0x23, 0x15, 0x07, 0x50, 0x65, 0x03, 0x0C, 0x00, 0x10, 0x00, 0x01, 0x1D, 0x00, 0x72, 0x51, 0xD0, 0x1E, 0x20, 0x6E, 0x28, 0x55, 0x00, 0xC4, 0x8E, 0x21, 0x00, 0x00, 0x1E, 0x01, 0x1D, 0x80, 0x18, 0x71, 0x1C, 0x16, 0x20, 0x58, 0x2C, 0x25, 0x00, 0xC4, 0x8E, 0x21, 0x00, 0x00, 0x9E, 0x8C, 0x0A, 0xD0, 0x90, 0x20, 0x40, 0x31, 0x20, 0x0C, 0x40, 0x55, 0x00, 0x4C, 0x6C, 0x42, 0x00, 0x00, 0x18, 0x01, 0x1D, 0x00, 0xBC, 0x52, 0xD0, 0x1E, 0x20, 0xB8, 0x28, 0x55, 0x40, 0x4C, 0x6C, 0x42, 0x00, 0x00, 0x1E, 0x01, 0x1D, 0x80, 0xD0, 0x72, 0x1C, 0x16, 0x20, 0x10, 0x2C, 0x25, 0x80, 0x4C, 0x6C, 0x42, 0x00, 0x00, 0x9E, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xED };
fd = fopen(path, mode); if (fd == NULL) { perror("/lib/firmware/edid/lg42lb9df.edid failed: "); return 1; }
fwrite(&firmware, 1024, 1, fd);
fclose(fd);
printf("Wrote 1024 bytes of edid data to %s\n", path);
return 0; }
Thanks very much Mark
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