Public bug reported:

Potentially a duplicate of Bug #1322413 (but different architecture and
video card)

Graphics card is  Radeon HD 6770. X.Org drivers. Clean install, video
works but color depth is < 24bpp. I tried adding DefaultDepth parameter
on xorg.conf, it caused screen to freeze on bootup.

Secondary card is integrated on the motherboard (Intel E3-1200 chipset).
Delivers 24bpp right away, no  tinkering required.

Thanks in advance

Michael

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8
ProcVersionSignature: Ubuntu 3.13.0-30.54-generic 3.13.11.2
Uname: Linux 3.13.0-30-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
CurrentDesktop: XFCE
Date: Sat Jul  5 17:12:34 2014
InstallationDate: Installed on 2014-06-04 (30 days ago)
InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug performance trusty

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https://bugs.launchpad.net/bugs/1338068

Title:
  Wrong color depth on Radeon HD 6770

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