docs/gnulinux/encrypted_trisquel.html: Troubleshooting

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 	<div class="section">
 
+		<h1 id="troubleshooting">Troubleshooting</h1>
+
+			<p>
+				A user reported issues when booting with a docking station attached
+				on an X200, when decrypting the disk in GRUB. The error
+				<i>AHCI transfer timed out</i> was observed. The workaround
+				was to remove the docking station.
+			</p>
+
+			<p>
+				Further investigation revealed that it was the DVD drive causing problems.
+				Removing that worked around the issue.
+			</p>
+
+<pre>
+
+&quot;sudo wodim -prcap&quot; shows information about the drive:
+Device was not specified. Trying to find an appropriate drive...
+Detected CD-R drive: /dev/sr0
+Using /dev/cdrom of unknown capabilities
+Device type    : Removable CD-ROM
+Version        : 5
+Response Format: 2
+Capabilities   : 
+Vendor_info    : 'HL-DT-ST'
+Identification : 'DVDRAM GU10N    '
+Revision       : 'MX05'
+Device seems to be: Generic mmc2 DVD-R/DVD-RW.
+
+Drive capabilities, per MMC-3 page 2A:
+
+  Does read CD-R media
+  Does write CD-R media
+  Does read CD-RW media
+  Does write CD-RW media
+  Does read DVD-ROM media
+  Does read DVD-R media
+  Does write DVD-R media
+  Does read DVD-RAM media
+  Does write DVD-RAM media
+  Does support test writing
+
+  Does read Mode 2 Form 1 blocks
+  Does read Mode 2 Form 2 blocks
+  Does read digital audio blocks
+  Does restart non-streamed digital audio reads accurately
+  Does support Buffer-Underrun-Free recording
+  Does read multi-session CDs
+  Does read fixed-packet CD media using Method 2
+  Does not read CD bar code
+  Does not read R-W subcode information
+  Does read raw P-W subcode data from lead in
+  Does return CD media catalog number
+  Does return CD ISRC information
+  Does support C2 error pointers
+  Does not deliver composite A/V data
+
+  Does play audio CDs
+  Number of volume control levels: 256
+  Does support individual volume control setting for each channel
+  Does support independent mute setting for each channel
+  Does not support digital output on port 1
+  Does not support digital output on port 2
+
+  Loading mechanism type: tray
+  Does support ejection of CD via START/STOP command
+  Does not lock media on power up via prevent jumper
+  Does allow media to be locked in the drive via PREVENT/ALLOW command
+  Is not currently in a media-locked state
+  Does not support changing side of disk
+  Does not have load-empty-slot-in-changer feature
+  Does not support Individual Disk Present feature
+
+  Maximum read  speed:  4234 kB/s (CD  24x, DVD  3x)
+  Current read  speed:  4234 kB/s (CD  24x, DVD  3x)
+  Maximum write speed:  4234 kB/s (CD  24x, DVD  3x)
+  Current write speed:  4234 kB/s (CD  24x, DVD  3x)
+  Rotational control selected: CLV/PCAV
+  Buffer size in KB: 1024
+  Copy management revision supported: 1
+  Number of supported write speeds: 4
+  Write speed # 0:  4234 kB/s CLV/PCAV (CD  24x, DVD  3x)
+  Write speed # 1:  2822 kB/s CLV/PCAV (CD  16x, DVD  2x)
+  Write speed # 2:  1764 kB/s CLV/PCAV (CD  10x, DVD  1x)
+  Write speed # 3:   706 kB/s CLV/PCAV (CD   4x, DVD  0x)
+
+Supported CD-RW media types according to MMC-4 feature 0x37:
+  Does write multi speed       CD-RW media
+  Does write high  speed       CD-RW media
+  Does write ultra high speed  CD-RW media
+  Does not write ultra high speed+ CD-RW media
+
+</pre>
+
+	</div>
+
+	<div class="section">
+
 		<p>
 			Copyright &copy;  2014, 2015 Francis Rowe &lt;info@gluglug.org.uk&gt;<br/>
 			Permission is granted to copy, distribute and/or modify this document