Dear Carsten, Am Donnerstag, den 15.03.2012, 00:35 +0100 schrieb Carsten Emde: > Einfaches Textdokument-Anlage > (drivers-gpu-drm-allow-to-load-edid-firmware.patch) somehow your message was send as an attachment. Could you configure your mailer (quilt) that it is send inline? > Broken monitors and/or broken graphic boards may send erroneous or no > EDID data. This also applies to broken KVM devices that are unable to > correctly forward the EDID data of the connected monitor but invent > their own fantasy data. > > This patch allows to specify an EDID data set to be used instead of > probing the monitor for it. It contains built-in data sets of frequently > used screen resolutions. In addition, a particular EDID data set may be > provided in the /lib/firmware directory and loaded via the firmware > interface. The name is passed to the kernel as module parameter of the > drm_kms_helper module either when loaded > options drm_kms_helper edid_firmware=edid/1280x1024.bin > or as kernel commandline parameter > drm_kms_helper.edid_firmware=edid/1280x1024.bin > > The built-in data sets are > Resolution Name > -------------------------------- > 1024x768 edid/1024x768.bin > 1280x1024 edid/1280x1024.bin > 1680x1050 edid/1680x1050.bin > 1920x1080 edid/1920x1080.bin > > They are ignored, if a file with the same name is available in the > /lib/firmware directory. > > The built-in EDID data sets are based on standard timings that may not > apply to a particular monitor and even crash it. Ideally, EDID data of > the connected monitor should be used. They may be obtained through the > drm/cardX/cardX-<connector>/edid entry in the /sys/devices PCI directory > of a correctly working graphics adapter. > > It is also possible to specify the name of an EDID data set on-the-fly > via the /sys/module interface, e.g. > echo edid/myedid.bin >/sys/module/drm_kms_helper/parameters/edid_firmware > The new screen mode is considered when the related kernel function is > called for the first time after the change. Such calls are made when the > X server is started or when the display settings dialog is opened in an > already running X server. > > Signed-off-by: Carsten Emde <C.Emde@xxxxxxxxx> > > --- > Documentation/EDID/1024x768.S | 44 ++++++ > Documentation/EDID/1280x1024.S | 44 ++++++ > Documentation/EDID/1680x1050.S | 44 ++++++ > Documentation/EDID/1920x1080.S | 44 ++++++ > Documentation/EDID/HOWTO.txt | 39 +++++ > Documentation/EDID/Makefile | 25 +++ > Documentation/EDID/edid.S | 261 ++++++++++++++++++++++++++++++++++++ > Documentation/EDID/hex | 1 > Documentation/kernel-parameters.txt | 10 + > drivers/gpu/drm/Kconfig | 11 + > drivers/gpu/drm/Makefile | 3 > drivers/gpu/drm/drm_crtc_helper.c | 8 - > drivers/gpu/drm/drm_edid.c | 4 > drivers/gpu/drm/drm_edid_load.c | 241 +++++++++++++++++++++++++++++++++ > include/drm/drm_crtc.h | 1 > include/drm/drm_edid.h | 1 > 16 files changed, 778 insertions(+), 3 deletions(-) […] > Index: linux-3.3-rc6/Documentation/kernel-parameters.txt > =================================================================== > --- linux-3.3-rc6.orig/Documentation/kernel-parameters.txt > +++ linux-3.3-rc6/Documentation/kernel-parameters.txt > @@ -713,6 +713,16 @@ bytes respectively. Such letter suffixes > The filter can be disabled or changed to another > driver later using sysfs. > > + drm_kms_helper.edid_firmware=<file> > + Broken monitors, graphic adapters and KVMs may > + send no or broken EDID data sets. This parameter > + allows to specify an EDID data set in the > + /lib/firmware directory that is used instead. > + Generic built-in EDID data sets are used, if one of > + edid/1024x768.bin, edid/1280x1024.bin, > + edid/1680x1050.bin, or edid/1920x1080.bin is given > + and no file with the same name exists. Maybe a hint to look into `Documentation/EDID` could be added? > + > dscc4.setup= [NET] > > earlycon= [KNL] Output early console device and options. > Index: linux-3.3-rc6/drivers/gpu/drm/Kconfig > =================================================================== > --- linux-3.3-rc6.orig/drivers/gpu/drm/Kconfig > +++ linux-3.3-rc6/drivers/gpu/drm/Kconfig > @@ -27,6 +27,17 @@ config DRM_KMS_HELPER > help > FB and CRTC helpers for KMS drivers. > > +config DRM_LOAD_EDID_FIRMWARE > + bool "Allow to specify an EDID data set instead of probing for it" > + depends on DRM_KMS_HELPER > + help > + Say Y here, if you want to use EDID data to be loaded from the > + /lib/firmware directory or one of the provided built-in > + data sets. This may be necessary, if the graphics adapter or > + monitor are unable to provide appropriate EDID data. Since this > + feature is provided as a workaround for broken hardware, the > + default case is N. Dito. > + > config DRM_TTM > tristate > depends on DRM […] Thanks, Paul
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