How to solve [drm:radeon_init [radeon]] *ERROR* No UMS support in radeon module! in CentOS 7?

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I watched my laptop reboot after a system update and there was an error mention that caught my attention. I issued a # dmesg | grep radeon and the results were:

[    0.000000] Command line: BOOT_IMAGE=/vmlinuz-3.10.0-327.10.1.el7.x86_64 root=/dev/mapper/centos-root ro crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet LANG=en_US.UTF-8 radeon.modeset=0 rd.driver.blacklist=radeon
[    0.000000] Kernel command line: BOOT_IMAGE=/vmlinuz-3.10.0-327.10.1.el7.x86_64 root=/dev/mapper/centos-root ro crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet LANG=en_US.UTF-8 radeon.modeset=0 rd.driver.blacklist=radeon
[    3.837187] [drm:radeon_init [radeon]] *ERROR* No UMS support in radeon module!

I understand UMS is deprecated, and I don’t really need very powerful video performance on this laptop, but it would be nice to have nicer font rendering.

# lspci
00:00.0 Host bridge: Intel Corporation 3rd Gen Core processor DRAM Controller (rev 09)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor PCI Express Root Port (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
00:14.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB xHCI Host Controller (rev 04)
00:16.0 Communication controller: Intel Corporation 7 Series/C210 Series Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 1 (rev c4)
00:1c.1 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 2 (rev c4)
00:1d.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation HM77 Express Chipset LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 7 Series Chipset Family 6-port SATA Controller [AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 7 Series/C210 Series Chipset Family SMBus Controller (rev 04)
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Chelsea LP [Radeon HD 7730M]
07:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 07)
08:00.0 Network controller: Qualcomm Atheros AR9485 Wireless Network Adapter (rev 01)

How to solve it?

Answer

I had a similar issue, in my case the reason was the nomodeset kernel parameter passed by GRUB2. I just removed it from the GRUB2 config and everything works well since then. I suppose that in your case, by analogy, the problem is with
radeon.modeset=0 rd.driver.blacklist=radeon
at the end of your kernel command line. Depending on how well you feel with GRUB configuration you can try to fix it manually or use GRUB Customizer (I went with the second option). Find the kernel command line and change it from

BOOT_IMAGE=/vmlinuz-3.10.0-327.10.1.el7.x86_64 root=/dev/mapper/centos-root ro crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet LANG=en_US.UTF-8 radeon.modeset=0 rd.driver.blacklist=radeon

to

BOOT_IMAGE=/vmlinuz-3.10.0-327.10.1.el7.x86_64 root=/dev/mapper/centos-root ro crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet LANG=en_US.UTF-8 radeon.modeset=1

or delete the “radeon.modeset=0 rd.driver.blacklist=radeon` part entirely.

Attribution
Source : Link , Question Author : gtludwig , Answer Author : Krzysiek Setlak

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