Vincent Danjean wrote: > For info, sometimes ago, I also add a problem with spurious > "[drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid ..." > Sorry, I do not remember from which exact kernel version it was. The > problems occurs for a second screen on DVI output of a laptop. It was > intermittent (ie most of the time, the EDID was correct but sometimes > the EDID was read incorrectly and the output was disabled).
There was recently (v2.6.39-rc2~3^2~24) an interesting fix in the area: | $ git show v2.6.39-rc2~3^2~24 | commit 4819d2e4310796c4e9eef674499af9b9caf36b5a | Author: Chris Wilson <ch...@chris-wilson.co.uk> | Date: Tue Mar 15 11:04:41 2011 +0000 | | drm: Retry i2c transfer of EDID block after failure | | Usually EDID retrieval is fine. However, sometimes, especially when the | machine is loaded, it fails, but succeeds after a few retries. | | Based on a patch by Michael Buesch. | | Reported-by: Michael Buesch <m...@bu3sch.de> | Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk> | Reviewed-by: Alex Deucher <alexdeuc...@gmail.com> | Signed-off-by: Dave Airlie <airl...@redhat.com> So I'd be interested in results using the kernel from experimental if you're willing. It would also be interesting to know approximately when "sometimes ago" is --- one month? one year? five years? > I "solved" this by adding > options drm_kms_helper poll=N Someone mentioned this workaround on lkml, too. I'm not so fond of workarounds before fixes; they hide bugs. :) Thanks, this seems useful. -- To UNSUBSCRIBE, email to debian-kernel-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20110502121723.GA12072@elie
