I have AMD/ATI RV740 PRO [Radeon HD 4770] video card connected to the PCIEX16_1 port of my Gigabyte GA-MA790FXT-UD5P motherboard that has no integrated video card.
My processor is AMD Phenom II X4 945, and I believe that it has no integrated graphics card on it as well. This my belief is based on the fact that all this is almost 20 years old. :) According to https://wiki.gentoo.org/wiki/Radeon I have set in my make.conf VIDEO_CARDS = "radeon r600" Also the same https://wiki.gentoo.org/wiki/Radeon instructs: "For cards that sit in an AGP slot, enable the AGP driver." https://uk.wikipedia.org/wiki/AGP says that PCI-Express is not AGP. However, lsmod currently shows me that both radeon and agpgart are loaded and used. Moreover, it shows that the radeon module uses the agpgart module. A selected output of lsmod command is shown below. Module Size Used by radeon 1613824 9 agpgart 32768 2 radeon,ttm amdgpu 9814016 0 drm_suballoc_helper 12288 2 amdgpu,radeon i2c_algo_bit 12288 2 amdgpu,radeon drm_ttm_helper 12288 2 amdgpu,radeon ttm 73728 3 amdgpu,radeon,drm_ttm_helper drm_display_helper 147456 2 amdgpu,radeon drm_kms_helper 55648 3 drm_display_helper,amdgpu,radeon drm 520192 16 gpu_sched,drm_kms_helper,drm_exec,drm_suballoc_helper,drm_display_helper,drm_buddy,amdgpu,radeon,drm_ttm_helper,ttm,amdxcp video 65536 2 amdgpu,radeon drm_exec 12288 1 amdgpu amdxcp 12288 1 amdgpu drm_buddy 16384 1 amdgpu gpu_sched 40960 1 amdgpu Why? Is the apggart module really needed? If not, why is it loaded? Will the system work without it? Shall I exclude it from kernel config? Moreover, the same lsmod table above shows that the amdgpu kernel module is also loaded. However, according to the note in https://wiki.gentoo.org/wiki/AMDGPU "Some older graphics cards are supported by both the amdgpu and the radeon kernel module. When using AMDGPU, it is recommended to unset the ATI Radeon option so that the radeon module is not built, or alternatively, to blacklist the radeon module (after rebooting check with lsmod | grep radeon to see if the blacklisting worked). The two modules are not meant to be loaded simultaneously, unless for specific systems that require it, e.g. for multiseat configurations." So, the same questions about ampgpu: Is this module really needed? (I guess it is not needed.) If not, why is it loaded? Will the system work without it? (I guess, yes.) Shall I exclude it from kernel config? (I guess, yes.) My guesses are based on the fact that the lsmod table above shows that amdgpu module is not used. I am interested to get answers to all these questions because currently I am trying to clean my kernel from unneeded modules.
