RE: PROBLEM: Issue With Radeon graphics With Lenovo Laptop G50-80

[Deucher, Alexander]

> -----Original Message-----
> From: Anil Nair [mailto:anilcoll90@xxxxxxxxx]
> Sent: Monday, May 08, 2017 11:42 AM
> To: Deucher, Alexander; lkml
> Subject: PROBLEM: Issue With Radeon graphics With Lenovo Laptop G50-80
> 
> Hi,
> 
> I recently decided to try out the latest Linux kernel release v4.11, I
> compiled and installed it, while booting the latest kernel; the screen
> freezes.There is no response from the kernel, the only option I have
> is to turn off and start it again.

Can you get the dmesg output after boot?  Defer loading the radeon driver (append modprobe.blacklist=radeon to the kernel command line in grub), then boot into a text console and attempt to manually load the driver (modprobe radeon).

> 
> I tried booting the kernel using debian recovery option, when i tried
> to load the radeon module here is the error i got,
> 
> anilnair@anilnair-lenovo:~$ dmesg | grep radeon
> [    1.255633] [drm] VGACON disable radeon kernel modesetting.
> [    1.255698] [drm:radeon_init [radeon]] *ERROR* No UMS support in
> radeon module!
> [   22.261475] [drm] VGACON disable radeon kernel modesetting.
> [   22.261500] [drm:radeon_init [radeon]] *ERROR* No UMS support in
> radeon module!
> anilnair@anilnair-lenovo:~$ sudo modprobe radeon
> [  716.704231] [drm] VGACON disable radeon kernel modesetting.
> [  716.704267] [drm:radeon_init [radeon]] *ERROR* No UMS support in
> radeon module!
> 
> I am attaching the relevant details, Please let me know if any further
> information is needed.

If you have nomodeset or radeon.modeset=0 on the kernel command line you are effectively disabling the driver.  The driver refuses to load if those are set.  Please remove them from your kernel command line to load the driver.

Alex