I tested the new packages in focal-proposed on a ThinkPad P15s, which
only have one resolution before. and the new packages in focal-proposed
works. The details:

0. the resolution supported, only one: 1920x1080
1. the original packages:

xserver-common                             2:1.20.8-2ubuntu2
xserver-xephyr                             2:1.20.8-2ubuntu2
xserver-xorg-core                          2:1.20.8-2ubuntu2
xserver-xorg-legacy                        2:1.20.8-2ubuntu2
xwayland                                   2:1.20.8-2ubuntu2

2. open focal-proposed channel and "sudo apt update".

3. sudo apt install xserver-common xserver-xephyr xserver-xorg-core
xserver-xorg-legacy xwayland

4. reboot

5. the new packages installed:

xserver-common                             2:1.20.8-2ubuntu2.2
xserver-xephyr                             2:1.20.8-2ubuntu2.2
xserver-xorg-core                          2:1.20.8-2ubuntu2.2
xserver-xorg-legacy                        2:1.20.8-2ubuntu2.2
xwayland                                   2:1.20.8-2ubuntu2.2

6. check the resolutions supported now: 1920x1080, 1680x1050, 1600x1024,
1400x1050....., total 23 resolutions supported now.


** Tags removed: verification-needed-focal
** Tags added: verification-done-focal

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1883497

Title:
  Only timing mode list in EDID supported on continuous freq monitors

Status in HWE Next:
  New
Status in X.Org X server:
  New
Status in xf86-video-intel:
  Unknown
Status in xorg-server package in Ubuntu:
  Fix Released
Status in xorg-server source package in Bionic:
  Confirmed
Status in xorg-server source package in Focal:
  Fix Committed

Bug description:
  [Impact]
  Some new laptop display set EDID continuous freq bit 1.
  Then Xorg only uses the timing modes defined in EDID, no other modes are 
shown on Xorg.

  Upstream Bug:
  https://gitlab.freedesktop.org/drm/intel/-/issues/313

  Fix of Xorg in merge request:
  https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/421

  
https://cgit.freedesktop.org/xorg/xserver/commit/?id=6a79a737e2c0bc730ee693b4ea4a1530c108be4e

  this is required to support new laptop models which use such panels

  [Test case]
  Test that a proper list of modes is shown with a panel that uses the new EDID.

  [Regression potential]
  The patch retains the previous code path for setting modes on GTF-able 
monitors, and only adds support for non-GTF monitors. So in that sense there 
shouldn't be any regression potential, this has been reviewed by an upstream 
expert.

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