I installed Ubuntu 12.10 on my Mac Mini Server 2012 (6,2 I think). I have a Dell U2412M (1920x1200@60Hz) connected via a Thunderbolt-Displayport cable.
From the moment rEFIt hands over to GRUB, the graphics look quite poor. Gradients are rough or dithered (including the boot splash, greeter screen and desktop background), window title bars look awful, and there a number of other ugly artefacts. The resolution itself, however, is fine.
The kernel is
lspci tells me I have:
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
I can't see any errors in
Xorg.0.log, but I don't want to paste the whole file here.
sudo lshw -C display gives:
*-display description: VGA compatible controller product: 3rd Gen Core processor Graphics Controller vendor: Intel Corporation physical id: 2 bus info: pci@0000:00:02.0 version: 09 width: 64 bits clock: 33MHz capabilities: msi pm vga_controller bus_master cap_list rom configuration: driver=i915 latency=0 resources: irq:49 memory:a0000000-a03fffff memory:90000000-9fffffff ioport:2000(size=64)
OpenGL info from
OpenGL vendor string: Intel Open Source Technology Center OpenGL renderer string: Mesa DRI Intel(R) Ivybridge Mobile OpenGL version string: 3.0 Mesa 9.0.1
lsmod shows that the
i915 driver is loaded.
Taking a screenshot does not demonstrate the problem (it looks fine when it's opened on another OS). Windows 7 and OSX look just fine on the same monitor using the Displayport input, and Ubuntu looks fine using the HDMI output via a HDMI-DVI converter.
So how do I get the colors to look right?