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No drm class cards found in /sys/class/drm

Open S-Ashja opened this issue 4 years ago • 1 comments

I am trying to use this library in an ARM linux environment .I have set up the basic code to read devices and set a certain feature but i keep getting this error message "No drm class cards found in /sys/class/drm" when calling this function ddca_create_display_ref(identity, &dref). Note:I had a prior discussion with Sanford and he has pointed out the cause,there is a workaround for it in the current 1.2.0-dev branch. I have attached the output of ddcutil environment --very-verbose output.txt

S-Ashja avatar Aug 30 '21 06:08 S-Ashja

Excerpts from previous email sent to S-Ashja in response to his problem report by direct email:

The message comes from the proof-of-concept code that attempts to detect addition and removal of displays. Currently its only function is to report changes. The message has no ill effect, but it is annoying since it repeats.

The current 1.2.0-dev branch contains changes to address the problem you reported. The experimental loop watching for display hotplug changes will be entered only if a DRM enabled video driver is present. There will be one message to the console in this case, instead of an infinitely repeating "No drm class cards found in /sys/class/drm" message.

rockowitz avatar Aug 30 '21 21:08 rockowitz