[Bug 261794] graphics/drm-kmod or x11-drivers/xf86-driver-intel? Xorg does not come up in screen native resolution.

From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 08 Feb 2022 16:36:00 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261794

            Bug ID: 261794
           Summary: graphics/drm-kmod or x11-drivers/xf86-driver-intel?
                    Xorg does not come up in screen native resolution.
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: sblachmann@gmail.com

When I start X Window on my T520 with FHD display, it comes up in a 960x540
resolution.

Looking at dmesg.boot, the start FB_INFO ... end FB_INFO section clearly shows
that originally, the native display resolution has been detected correctly.

Looking at Xorg.0.log, the 1920x1080 DDC modeline is shown correctly.

Nevertheless Xorg appears in a mode with half of the actual display's
dimensions and I have to add the native mode using xrandr addmode to make Xorg
display in the correct resolution. (see the workaround hack:
https://askubuntu.com/questions/1193045/wrong-resolution-missing-1920x1080-on-lenovo-w520-after-update-to-ubuntu-18-04
)

Seems to be a regression, but I lack the intimate knowledge to say whether it
is a drm-kmod or intel driver issue.

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