19.10 on mid 2011 iMac display driver

**shivahnshankar** · October 22nd, 2019

Hi
I just installed 19.10 Ubuntu on mid 2011 iMac with AMD Radeon HD 6750M GPU. Installation went fine but when i check which display driver is used, i see the following:

$lsmod shows
i915 1945600 2
drm_kms_helper 184320 2 radeon,i915
drm 491520 10 drm_kms_helper,radeon,i915,ttm
i2c_algo_bit 16384 2 radeon,i915
video 49152 1 i915

$lspci -nnvv shows:
01:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] Turks HDMI Audio [Radeon HD 6500/6600 / 6700M Series] [1002:aa90]
Subsystem: Apple Inc. Turks HDMI Audio [Radeon HD 6500/6600 / 6700M Series] [106b:aa90]
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 256 bytes
Interrupt: pin B routed to IRQ 52
Region 0: Memory at a8840000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: snd_hda_intel
Kernel modules: snd_hda_intel

So does this mean the Intel 915 driver is being used instead of Radeon? Please help me understand.
Thanks
Shiva

**jimmyrus** · October 22nd, 2019

nah, it shows those modules are loaded. Also shows that you have audio from hdmi on the radeon card. The radeon module is loaded too, along with several other modules which is normal. Whats the concern and why does it matter? Is your system running ok?

**shivahnshankar** · October 22nd, 2019

System is working fine but since i am coming to Gnome after sometime, i felt there is a slight delay in animations.
Thanks and its good to know that everything's fine.
Regards

**shivahnshankar** · October 24th, 2019

Ok i found probably a related issue. I am unable to change brightness of the display. The keyboard keys and the setting applet show that brightness is increased but there is no change in actual brightness.