Hi, I just got the same problem on a lenovo computer after installing stretch on it:
Manufacturer: LENOVO Product Name: 3235H3G Version: ThinkCentre M92 It has this graphic card : 00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller (rev 09) (prog-if 00 [VGA controller]) Subsystem: Lenovo Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller Flags: bus master, fast devsel, latency 0, IRQ 11 Memory at f7800000 (64-bit, non-prefetchable) [size=4M] Memory at e0000000 (64-bit, prefetchable) [size=256M] I/O ports at f000 [size=64] [virtual] Expansion ROM at 000c0000 [disabled] [size=128K] Capabilities: [90] MSI: Enable- Count=1/1 Maskable- 64bit- Capabilities: [d0] Power Management version 2 Capabilities: [a4] PCI Advanced Features Kernel modules: i915 The VNC Config file is in /usr/share/X11/xorg.conf.d/99-vnc.conf : Section "Module" Load "vnc" EndSection Section "Screen" Identifier "Screen0" Device "Card0" Monitor "Monitor0" Option "QueryConnectTimeout" "30" Option "AcceptSetDesktopSize" "0" Option "IdleTimeout" "60" Option "SecurityTypes" "VncAuth" Option "QueryConnect" Option "UserPasswdVerifier" "VncAuth" Option "PasswordFile" "/etc/vncpasswd" EndSection The X session was just unusable on this computer, the mouse really slow, and no process in top seemed to take resources. There was no EE messages in Xorg.0.log When I saw in the message #22 '(EE) modeset(0): failed to set mode: Permission denied', I tried to reboot the computer with the kernel parameter "nomodeset" and it solved the issue for me. I'm now going to install the rest of my computers with nomodeset, since my users never use the console. Kernel version : Linux enzio 4.9.0-4-amd64 #1 SMP Debian 4.9.51-1 (2017-09-28) x86_64 GNU/Linux Cheers Pierre
