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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1774425
Title:
i915 driver limits virtual resolution to 8192x8192
Status in linux package in Ubuntu:
Incomplete
Bug description:
I have an Intel Iris Pro 580 in my Intel Skull Canyon NUC6I7KYK, a
nice little device that has 3 video outputs:
* HDMI 2.0
* Mini DisplayPort
* Thunderbolt USB-C
The product specifications states that the device is able to output
three 4K signals. Unfortunately, whenever I tried this in Ubuntu it
failed, without any clear error message.
After fiddling with other DEs, Kubuntu told me the virtual resolution
was not supported. And indeed, as soon as I limited the virtual
resolution of the 3 screens to fit in 8192x8192 pixels, all screens
worked.
Apparently, the i915 driver (in
"drivers/gpu/drm/i915/intel_display.c") has not been updated for newer
devices when reporting the maximum resolution.
As you can see here:
https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/i915/intel_display.c#L14671
Only GEN_2 & GEN_3 are checked for, but since the 7th generation max
virtual resolutions of 16384x16384 are supported.
This issue has been reported to the i915 maintainers a few times, but
nothing has changed yet :/
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