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    SubjectRe: [PATCH 1/3] drivers-gpu-drm-allow-to-load-edid-firmware.patch

    > On Sun, 11 Mar 2012 22:23:22 +0100, Carsten Emde wrote:
    >> On 03/11/2012 02:44 PM, Alan Cox wrote:
    >>>> This patch allows to load an EDID data set via the firmware interface.
    >>>> It contains data sets of frequently used screen resolutions (1024x768,
    >>>> 1280x1024, 1680x1050 and 1920x1080). The requested EDID data are
    >>>> specified as a module parameter of the drm_kms_helper module, e.g.
    >>>> options drm_kms_helper edid_firmware=edid/1280x1024.bin or as kernel
    >>>> command line parameter.
    >>> What if the DRM layer and driver are compiled in. They'll come up as
    >>> console before the file system so the firmware request will hang ?
    >> Admittedly I did not try to compile the DRM layer and driver into the
    >> kernel. However, I created an error condition by specifying a
    >> non-existing EDID file. In this case, the function returns with error,
    >> the mode count remains 0, and the system continues to run as if the
    >> edid_firmware= parameter had not been specified.
    > Unfortunately, as of at least last month, my system hangs when I try to
    > use your feature (just as described by Alan Cox); the log shows that
    > during the boot process, there is a one-minute hang:
    > [ 0.175207] [drm] radeon: power management initialized
    > [ 60.896507] [drm:edid_load] *ERROR* Requesting EDID firmware "edid/1920x1200.bin" failed (err=-2)
    > Is there any way to make your feature smarter about its timing with
    > relation to file system accessibility?

    Please copy your EDID data file to the directory "firmware/edid" of the
    kernel source tree, configure


    and rebuild/reboot your kernel.

    Does it work then?


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