[Intel-gfx] Fast User Switching does not seem to work

[constantine]

Hello all!

I am encountering a peculiar problem with Fast User Switching or Kernel
Mode Setting and I do not know how to troubleshoot it.

When I run two (or more) Virtual Terminals switching between them
(Ctrl+Alt+F2-3, etc.) takes 2+ seconds. (That is either simply initiated
with startx from tty2 and tty3 or as different displays with KDisplay
Manager (kdm) in :0 and :1)

I am using an intel graphics driver so I suppose KMS should be enabled by
default and this seems to be the case, but there still are delays swithing
 VTs.

I have followed the instructions at
http://carlosbecker.com/posts/how-to-enable-kms-on-i915-graphiccard-archlinux/
 https://wiki.archlinux.org/index.php/kernel_mode_setting
https://wiki.archlinux.org/index.php/Intel_graphics but I am still
experiencing the problem.

Last, I am certain it is not a hardware related issue, because I can fast
switch in ubuntu, but not in Arch linux.



Any ideas?




$ sudo cat /sys/module/i915/parameters/modeset
1

### Note: ### Before starting the "process" of enabling KMS (which I
suppose it should be enabled in the first place, right?) this value was:
 -1

$ uname -a
Linux myhostname 3.16.4-1-ARCH #1 SMP PREEMPT Mon Oct 6 08:22:27 CEST 2014
x86_64 GNU/Linux

$ lsmod | grep -e drm -e 915 -e kms
crc32_pclmul        12915     0
scsi_mod              142915   4 uas,usb_storage,libata,sd_mod
i915                       864879  8
button                    12909    1 i915
i2c_algo_bit           12744    1 i915
video                      17995    1 i915
drm_kms_helper    49262    1 i915
drm                         258005  10 i915,drm_kms_helper
i2c_core                  50152    5 drm,i915,i2c_i801,drm_kms_helper,
i2c_algo_bit
intel_gtt                   17848    2 i915,intel_agp

$ sudo lspci -vvnn | head -28 | tail -21
00:02.0 VGA compatible controller [0300]: Intel Corporation Xeon E3-1200
v2/3rd Gen Core processor Graphics Controller [8086:0152] (rev 09) (prog-if
00 [VGA controller])
        Subsystem: ASRock Incorporation Device [1849:0152]
        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
        Interrupt: pin A routed to IRQ 40
        Region 0: Memory at f7800000 (64-bit, non-prefetchable) [size=4M]
        Region 2: Memory at e0000000 (64-bit, prefetchable) [size=256M]
        Region 4: I/O ports at f000 [size=64]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
                Address: fee0f00c  Data: 4181
        Capabilities: [d0] Power Management version 2
                Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [a4] PCI Advanced Features
                AFCap: TP+ FLR+
                AFCtrl: FLR-
                AFStatus: TP-
        Kernel driver in use: i915
        Kernel modules: i915

$ head -10 /var/log/Xorg.0.log
[     4.919]
X.Org X Server 1.16.1
Release Date: 2014-09-21
[     4.919] X Protocol Version 11, Revision 0
[     4.919] Build Operating System: Linux 3.16.1-1-ARCH x86_64
[     4.919] Current Operating System: Linux myhostname 3.16.4-1-ARCH #1
SMP PREEMPT Mon Oct 6 08:22:27 CEST 2014 x86_64
[     4.919] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-linux
root=UUID=af9a90ee-5db2-4abf-b8be-006a65e9f09e rw quiet video=SVIDEO-1:d
[     4.920] Build Date: 21 September 2014  10:53:13AM
[     4.920]
[     4.920] Current version of pixman: 0.32.6

### Note: ### As kernel parameters I have also tried video=SVIDEO-1:d,
i915.modeset=1,
and nothing, but neither works.
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